linux-kernel - Re: [PATCH 08/28] nios2: MMU Fault handling

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Message-ID: <20140422143036.GD15745@arch.cereza>
Date:	Tue, 22 Apr 2014 11:30:37 -0300
From:	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
To:	Ley Foon Tan <lftan@...era.com>
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org, lftan.linux@...il.com,
	cltang@...esourcery.com
Subject: Re: [PATCH 08/28] nios2: MMU Fault handling

Hello Ley Foon,

On Apr 18, Ley Foon Tan wrote:
> +
> +bad_area_nosemaphore:
> +	/* User mode accesses just cause a SIGSEGV */
> +	if (user_mode(regs)) {

I found that it's useful to add some printing here, just as ARM
does. I carry this patch on my kernel:

+               printk(KERN_INFO "%s: unhandled page fault (%d) at 0x%08lx, cause %ld\n",
+                      current->comm, SIGSEGV, address, cause);
+               show_regs(regs);

Do you think we could do something like it? Maybe with a compile time option?

> +		_exception(SIGSEGV, regs, code, address);
> +		return;
> +	}
> +
-- 
Ezequiel García, Free Electrons
Embedded Linux, Kernel and Android Engineering
http://free-electrons.com
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